Java ConcurrentSkipListSet last()用法及代码示例

java.util.concurrent.ConcurrentSkipListSet的last()方法是Java中的一个内置函数，它返回当前该集中的最后一个(最高)元素。

用法:

public E last()

返回值：该函数返回返回当前在此集合中的最后一个(最高)元素。

异常：如果此集合为空，则该函数将引发NoSuchElementException。

以下示例程序旨在说明ConcurrentSkipListSet.last()方法：

示例1:

// Java program to demonstrate last() 
// method of ConcurrentSkipListSet 
  
import java.util.concurrent.ConcurrentSkipListSet; 
  
class ConcurrentSkipListSetLastExample1 { 
    public static void main(String[] args) 
    { 
  
        // Initializing the set 
        ConcurrentSkipListSet<Integer> 
            set = new ConcurrentSkipListSet<Integer>(); 
  
        // Adding elements to this set 
        set.add(78); 
        set.add(64); 
        set.add(12); 
        set.add(45); 
        set.add(8); 
  
        // Printing the highest element of the set 
        System.out.println("The highest element of the set: "
                           + set.last()); 
    } 
}

输出：

The highest element of the set: 78

示例2:程序以在last()中显示NoSuchElementException。

// Java program to demonstrate last() 
// method of ConcurrentSkipListSet 
  
import java.util.concurrent.ConcurrentSkipListSet; 
  
class ConcurrentSkipListSetLastExample1 { 
    public static void main(String[] args) 
    { 
  
        // Initializing the set 
        ConcurrentSkipListSet<Integer> 
            set = new ConcurrentSkipListSet<Integer>(); 
        try { 
            // Printing the highest element of the set 
            System.out.println("The highest element of the set: "
                               + set.last()); 
        } 
        catch (Exception e) { 
            System.out.println("Exception: " + e); 
        } 
    } 
}

输出：

Exception: java.util.NoSuchElementException

参考：https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#last–

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注：本文由纯净天空筛选整理自rupesh_rao大神的英文原创作品 ConcurrentSkipListSet last() method in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。